Brother HL 5370DW - Manual (Page 106)

Routine Maintenance
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6
b Take out the drum unit and toner cartridge assembly.
IMPORTANT
We recommend that you put the drum unit and toner cartridge assembly on a piece of disposable paper or
cloth in case you accidentally spill or scatter toner.
To prevent damage to the printer caused by static electricity, DO NOT touch the electrodes shown in the
illustration.
c Push down the blue lock lever and take the toner cartridge out of the drum unit.